IdealPbx app for iPhone and iPad

Idealpbx is Voice Over IP phone (VoIP), compatible with the SIP protocol.
Idealpbx can be used with a large number of SIP-compatible VoIP service providers.

This softphone supported features:

-Audio with the following codecs: speex (narrow band and wideband), G711 (ulaw,alaw),ILBC, GSM, SILK, G722, OPUS, AAC-ELD
- Secured call (SIP TLS/SRTP/ZRTP)
- Video with the VP8 codec (H264 & MPEG4 on demand )
- AVPF RFC support for network resilience
- Multiple calls
- Audio conferencing
- Address book integration
- Call history
- DTMF (telephone tones) support using SIP INFO or RFC2833
- Text messaging